Although not a prime focus, the results from this study provide further support for dimensional models of psychopathology (Krueger & Tackett, 2003; Clark, 2005). A substantial proportion of the genetic risks for a relatively wide range of disorders and traits can be parsimoniously captured by two common genetic factors. These results raise the question of whether the focus for gene finding efforts for common psychiatric and substance use disorders should remain on the individual disorders or instead shift to focusing on broader spectra (Dick et al. 2008).
